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+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * objectstack#26845 — the two departures objectstack#26705 left open in the
+ * Data pillar: creating an object, and opening another object from the
+ * Pending changes sheet. Both load another object into the one buffer a held
+ * edit lives in, so both ask the shared departure question first.
+ *
+ * New object asks before its dialog opens, so Cancel costs nothing and the
+ * create itself asks nothing. A Pending changes request for another object
+ * asks before the pillar applies it; one for the open object drops nothing
+ * and asks nothing.
+ *
+ * Rendered through the REAL `StudioDesignSurface` on the real route shape, as
+ * in `StudioDesignSurface.heldDataLeave-26705.test.tsx`; the sheet is a stand-in
+ * that asks the host for an object exactly as its security block does
+ * (`useSurfaceNavigator`).
+ */
+
+import '@testing-library/jest-dom/vitest';
+import * as React from 'react';
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { render, screen, fireEvent, cleanup, waitFor, within } from '@testing-library/react';
+import { MemoryRouter, Route, Routes } from 'react-router-dom';
+
+const PKG = 'com.acme.app';
+
+const OBJECTS: Record<string, Record<string, unknown>> = {
+  acme_task: { name: 'acme_task', label: 'Task', fields: [{ name: 'title', label: 'Title', type: 'text' }] },
+  acme_note: { name: 'acme_note', label: 'Note', fields: [{ name: 'body', label: 'Body', type: 'text' }] },
+};
+
+const mockClient = vi.hoisted(() => ({
+  list: vi.fn(async (_type: string) => [] as unknown[]),
+  listDrafts: vi.fn(async () => []),
+  listTypes: vi.fn(async () => ({ entries: [] })),
+  get: vi.fn(async () => null),
+  references: vi.fn(async () => []),
+  layered: vi.fn(async (_type: string, _name: string) => ({ code: null, overlay: null, overlayScope: null, effective: null as unknown })),
+  getDraft: vi.fn(async () => null),
+  save: vi.fn(async () => ({ success: true })),
+  publishDraft: vi.fn(async () => ({ success: true })),
+  publishPackageDrafts: vi.fn(async () => ({ success: true, failed: [] })),
+  publish: vi.fn(async () => ({ success: true })),
+  reset: vi.fn(async () => ({})),
+}));
+
+vi.mock('../metadata-admin/useMetadata', async (importOriginal) => {
+  const mod = await importOriginal<typeof import('../metadata-admin/useMetadata')>();
+  return { ...mod, useMetadataClient: () => mockClient, useMetadataTypes: () => ({ entries: [] }) };
+});
+
+vi.mock('./packages-io', async (importOriginal) => {
+  const mod = await importOriginal<typeof import('./packages-io')>();
+  return {
+    ...mod,
+    fetchPackages: vi.fn(async () => [{ id: 'com.acme.app', name: 'Acme', writable: true, namespace: 'acme' }]),
+  };
+});
+
+vi.mock('@object-ui/react', async (importOriginal) => {
+  const mod = await importOriginal<typeof import('@object-ui/react')>();
+  return { ...mod, useAdapter: () => dataSource };
+});
+
+vi.mock('./StudioAiCopilot', () => ({ StudioChatDock: () => null }));
+// Stands in for the Pending changes sheet: its security block asks the host to
+// open the object a draft names, through the surface channel.
+vi.mock('../../preview/DraftChangesPanel', async () => {
+  const { createElement } = await import('react');
+  const { useSurfaceNavigator } = await import('./surfaceDeepLinkChannel');
+  return {
+    DraftChangesPanel: () => {
+      const openSurface = useSurfaceNavigator();
+      return createElement(
+        'div',
+        null,
+        ['acme_task', 'acme_note'].map((name) =>
+          createElement(
+            'button',
+            { key: name, type: 'button', onClick: () => openSurface?.({ type: 'object', name }) },
+            `Pending object/${name}`,
+          ),
+        ),
+      );
+    },
+  };
+});
+
+import { StudioDesignSurface } from './StudioDesignSurface';
+import { addFieldFromFormToolbar } from './__tests__/dataPillarAddField';
+import { createEmptyDataSource } from './__tests__/emptyDataSource';
+import { registerBuiltinInspectors } from '../metadata-admin/inspectors';
+import { t } from '../metadata-admin/i18n';
+
+const dataSource = createEmptyDataSource();
+registerBuiltinInspectors();
+
+vi.stubGlobal(
+  'fetch',
+  vi.fn(async () => new Response('null', { status: 404, headers: { 'content-type': 'application/json' } })),
+);
+
+window.matchMedia = ((query: string) => ({
+  matches: false,
+  media: query,
+  onchange: null,
+  addEventListener: () => {},
+  removeEventListener: () => {},
+  addListener: () => {},
+  removeListener: () => {},
+  dispatchEvent: () => false,
+})) as unknown as typeof window.matchMedia;
+(globalThis as { ResizeObserver?: unknown }).ResizeObserver =
+  (globalThis as { ResizeObserver?: unknown }).ResizeObserver ??
+  class {
+    observe() {}
+    unobserve() {}
+    disconnect() {}
+  };
+
+// This jsdom environment ships no window.confirm — install a mock outright.
+let confirmSpy: ReturnType<typeof vi.fn>;
+const LEAVE_QUESTION = t('engine.edit.unsavedLeaveConfirm', 'en');
+
+beforeEach(() => {
+  for (const fn of Object.values(mockClient)) (fn as unknown as { mockClear: () => void }).mockClear();
+  mockClient.list.mockImplementation(async (type: string) =>
+    type === 'object' ? Object.values(OBJECTS).map((o) => ({ name: o.name, label: o.label, _packageId: PKG })) : [],
+  );
+  mockClient.layered.mockImplementation(async (type: string, name: string) => ({
+    code: null,
+    overlay: null,
+    overlayScope: null,
+    effective: type === 'object' && OBJECTS[name] ? JSON.parse(JSON.stringify(OBJECTS[name])) : null,
+  }));
+  confirmSpy = vi.fn();
+  window.confirm = confirmSpy as unknown as typeof window.confirm;
+});
+
+afterEach(() => {
+  cleanup();
+  localStorage.clear();
+  window.history.replaceState(null, '', '/');
+});
+
+/** The object the header names: its api-name chip. */
+async function openObjectIs(name: string): Promise<void> {
+  await waitFor(
+    () => expect(within(screen.getByTestId('data-object-header')).getByTestId('studio-item-api-name')).toHaveTextContent(name),
+    { timeout: 8000 },
+  );
+}
+
+async function openTask(): Promise<void> {
+  // The shell's link guard reads the window's URL to skip a link to the page
+  // already shown; `BrowserRouter` keeps the two equal, so this does too.
+  window.history.replaceState(null, '', `/studio/${PKG}/data`);
+  render(
+    <MemoryRouter initialEntries={[`/studio/${PKG}/data`]}>
+      <Routes>
+        <Route path="/studio/:packageId/:tab" element={<StudioDesignSurface />} />
+      </Routes>
+    </MemoryRouter>,
+  );
+  await openObjectIs('acme_task');
+}
+
+/** The card's repro: add a Picklist "Priority" with no option yet; the autosave holds it. */
+async function holdAPicklist(): Promise<void> {
+  fireEvent.click(await screen.findByRole('button', { name: 'Form' }));
+  await addFieldFromFormToolbar(undefined, { label: 'Priority', type: /^Picklist$/ });
+  await screen.findByTestId('studio-held', undefined, { timeout: 8000 });
+}
+
+const newObject = () => fireEvent.click(within(screen.getByTestId('studio-rail-data')).getByTestId('studio-rail-add'));
+const pendingRequest = (name: string) => fireEvent.click(screen.getByRole('button', { name: `Pending object/${name}` }));
+
+describe('a held Data field guards create and Pending changes (objectstack#26845)', () => {
+  it('New object asks; Cancel opens no dialog and keeps the held field, OK opens it and the create asks nothing', async () => {
+    await openTask();
+    await holdAPicklist();
+
+    confirmSpy.mockReturnValueOnce(false);
+    newObject();
+    expect(confirmSpy).toHaveBeenCalledTimes(1);
+    expect(confirmSpy).toHaveBeenCalledWith(LEAVE_QUESTION);
+    expect(screen.queryByRole('dialog')).toBeNull();
+    expect(screen.getByTestId('studio-held')).toBeInTheDocument();
+
+    confirmSpy.mockReturnValueOnce(true);
+    newObject();
+    expect(confirmSpy).toHaveBeenCalledTimes(2);
+    const dialog = await screen.findByRole('dialog');
+    fireEvent.change(within(dialog).getByLabelText(t('engine.studio.data.nameLabel', 'en')), {
+      target: { value: 'Ticket' },
+    });
+    fireEvent.click(within(dialog).getByRole('button', { name: t('engine.studio.createDraft', 'en') }));
+    await openObjectIs('acme_ticket');
+    expect(confirmSpy).toHaveBeenCalledTimes(2);
+  });
+
+  it('a Pending changes request for another object asks; Cancel keeps the held field, OK opens the object', async () => {
+    await openTask();
+    await holdAPicklist();
+
+    confirmSpy.mockReturnValueOnce(false);
+    pendingRequest('acme_note');
+    await waitFor(() => expect(confirmSpy).toHaveBeenCalledTimes(1));
+    expect(confirmSpy).toHaveBeenCalledWith(LEAVE_QUESTION);
+    await openObjectIs('acme_task');
+    expect(screen.getByTestId('studio-held')).toBeInTheDocument();
+
+    // A request for the open object drops nothing, so it asks nothing.
+    pendingRequest('acme_task');
+    await openObjectIs('acme_task');
+    expect(screen.getByTestId('studio-held')).toBeInTheDocument();
+    expect(confirmSpy).toHaveBeenCalledTimes(1);
+
+    confirmSpy.mockReturnValueOnce(true);
+    pendingRequest('acme_note');
+    await waitFor(() => expect(confirmSpy).toHaveBeenCalledTimes(2));
+    await openObjectIs('acme_note');
+    expect(screen.queryByTestId('studio-held')).toBeNull();
+  });
+
+  // CONTROL: nothing held, nothing asked.
+  it('with no edit held, New object and a Pending changes request never ask', async () => {
+    await openTask();
+
+    pendingRequest('acme_note');
+    await openObjectIs('acme_note');
+    newObject();
+    await screen.findByRole('dialog');
+    expect(confirmSpy).not.toHaveBeenCalled();
+  });
+});